Checkout Procedure; Thermostat Circuit; System Circuit; Damper Circuit - EWC Controls ULTRA-ZONE ST2E Series Technical Bulletin

CH ECK OU T PR OC EDUR E
ZONE 3
D15
T'STAT
C
D16
W
D18
Y
D17
R
R6
K6
ZONE 2
C6
T'STAT
+
C
D11
W
D12 Y
R
D10
D9
ZONE 1
D3 T'STAT
C
D4
W
D6
Y
D5
R
K7
R7
C7
+
R1
0
D21
B
CAUTION
D22
G
PLEASE read all
D20
instructions carefully
D19
before starting the
installation
D24
procedures.
D23
0
D25 R
ADDITIONAL
D26 C
ZONE PANEL
+
-

#12: SYSTEM CIRCUIT

EWC Controls Inc. •

#11: THERMOSTAT CIRCUIT

HEATING MODE
EWC-ST-3E
ZONE3
MOTOR
K3
OPEN
M6
M4
M2
CLOSE
M1
K5
ZONE2 SW2
MOTOR
OPEN
M6
M4
K2
M2
CLOSE
M1
SW1
ZONE1
MOTOR
OPEN K1
M6
M4
M2
CLOSE
M1
24V
K4
T'FORMER
2
CB1
1
K8
B
O
X
Y
K9
W
G
R
CONTROLS
Englishtown
385 Highway 33 • Englishtown, NJ 07726 •
OFF MODE

#13: DAMPER CIRCUIT

STAT CALLING NOT CALLING
DAMPER OPEN CLOSED
O VOLTS
24 VOLTS
24 VOLTS
O VOLTS
24 VOLTS 24 VOLTS
COMMON COMMON
O VOLTS
24 VOLTS
24 VOLTS
O VOLTS
24 VOLTS 24 VOLTS
COMMON
COMMON
O VOLTS 24 VOLTS
24 VOLTS O VOLTS
24 VOLTS 24 VOLTS
COMMON
COMMON
24 VOLTS
INPUT TO PANEL:
COMMON
NOTE: Conditions shown are with at
least one thermostat always calling.
When all thermostats satisfy, damper
position will depend on position of
"OPEN-CLOSED" switch. In "OPEN"
position, damper will drive to open
position. In "CLOSED" position, all
voltage is removed from damper motor;
motor will remain in whatever position it
was in when all thermostats satisfied.
If 24 volts is present from M1 to M4 and
M1 to M6, damper motor may either be
turning or stuck between open and
closed postions.
800-446-3110 • FAX 732-446-5362
COOLING MODE
EWC-ST-3E
ZONE3
MOTOR
K3
OPEN
M6
M4
M2
CLOSE
M1
K5
ZONE2 SW2
MOTOR
OPEN
M6
M4
K2
M2
CLOSE
M1
SW1
ZONE1
MOTOR
OPEN K1
M6
M4
M2
CLOSE
M1
24V
K4
T'FORMER
2
CB1
1
K8
B
O
X
Y
K9
W
G
R
CONTROLS
Englishtown
7